A spaceship ferrying workers to moon-base I takes a straight-line path from the earth to the moon, a distance of 384,000 km. Suppose the spaceship starts from rest and
accelerates at 20 m/s2
, for the first 15 min of the trip, and then travels at constant velocity
until the last 15 min when it slows down at a rate of 20 m/s2
, just coming to rest as it
reaches the moon.
a) What is the maximum velocity attained? (Ans: 1.8 x 104
m/s)
b) What fraction of the total distance is traveled at constant speed? ( Ans: 95.78 % )
c) What total time is required for the whole trip?

What is the difference between electrically neutral objects and electrically charged objects

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to. in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .